A granular soil (sand) was tested in the laboratory and found to have maximum and minimum void ratio of 0.84 and 0.38, respectively. The value of Gs was determined to be 2.65. A natural soil deposit of the same sand has 9% moisture, and its moist unit weight is 18.64 kN/m3 . Determine the relative density of the soil in the field.

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.

Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k

Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.